Move matches test in matches module

Author: flip1995

clippy_lints/src/matches.rs

@@ -1197,3 +1197,40 @@ where
 
     None
 }
+
+#[test]
+fn test_overlapping() {
+    use rustc_span::source_map::DUMMY_SP;
+
+    let sp = |s, e| SpannedRange {
+        span: DUMMY_SP,
+        node: (s, e),
+    };
+
+    assert_eq!(None, overlapping::<u8>(&[]));
+    assert_eq!(None, overlapping(&[sp(1, Bound::Included(4))]));
+    assert_eq!(
+        None,
+        overlapping(&[sp(1, Bound::Included(4)), sp(5, Bound::Included(6))])
+    );
+    assert_eq!(
+        None,
+        overlapping(&[
+            sp(1, Bound::Included(4)),
+            sp(5, Bound::Included(6)),
+            sp(10, Bound::Included(11))
+        ],)
+    );
+    assert_eq!(
+        Some((&sp(1, Bound::Included(4)), &sp(3, Bound::Included(6)))),
+        overlapping(&[sp(1, Bound::Included(4)), sp(3, Bound::Included(6))])
+    );
+    assert_eq!(
+        Some((&sp(5, Bound::Included(6)), &sp(6, Bound::Included(11)))),
+        overlapping(&[
+            sp(1, Bound::Included(4)),
+            sp(5, Bound::Included(6)),
+            sp(6, Bound::Included(11))
+        ],)
+    );
+}